Skip to main content
Using Deno in production at your company? Earn free Deno merch.
Give us feedback
Go to Latest
File
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { dropLastWhile } from "./drop_last_while.ts";import { assertEquals } from "../testing/asserts.ts";
Deno.test("[collections/dropLastWhile] Num array", () => { const values = [20, 33, 44];
const actual = dropLastWhile(values, (i) => i > 30);
assertEquals(actual, [20]);});
Deno.test("[collections/dropLastWhile] No mutation", () => { const array = [1, 2, 3, 4, 5, 6];
const actual = dropLastWhile(array, (i) => i > 4);
assertEquals(actual, [1, 2, 3, 4]); assertEquals(array, [1, 2, 3, 4, 5, 6]);});
Deno.test("[collections/dropLastWhile] Negatives", () => { const array = [-1, -2, -3, -4, -5, -6];
const actual = dropLastWhile(array, (i) => i < -4);
assertEquals(actual, [-1, -2, -3, -4]);});
Deno.test("[collections/dropLastWhile] Empty input returns empty array", () => { const array: number[] = [];
const actual = dropLastWhile(array, (i) => i > 4);
assertEquals(actual, []);});
Deno.test("[collections/dropLastWhile] Returns same array when the last element doesn't get dropped", () => { const array = [40, 30, 20];
const actual = dropLastWhile(array, (i) => i > 40);
assertEquals(actual, [40, 30, 20]);});
Deno.test("[collections/dropLastWhile] Returns empty array when all elements get dropped", () => { const array = [20, 30, 20];
const actual = dropLastWhile(array, (i) => i < 40);
assertEquals(actual, []);});